It's research for this year's NaNo novel...don't ask.
I need to get my hands on a copy of The Language of Flowers. Wikipedia has about a hundred different ways of expressing love via floriography but nothing that says "I screwed up, please don't dump me," or even a simple "I'm sorry."
*looks at the list again* I guess I could go with marigolds, those are for pain and grief apparently. If anyone comes up with a better answer please halp!